PLOTTING BOARD Russian patent published in 2006 - IPC A45F3/50 G09B29/06 

FIELD: traveling or camp equipment.

SUBSTANCE: plotting board comprises transparent lid and nontransparent rectangular housing with rigid vertical walls and bottom parallel to the lid. The lid is secured to the housing for permitting detachment. The top and bottom pointers made of rectangular plates with central longitudinal passage of triangle cross-section filled with black paint are movably mounted from below and from above of the lid. Each of the pointers is provided with ball bearings. The flexible threads are tightened under the transparent lid transverse to the plotting board. The V-shaped supports are mounted on the bottom of the plotting board. The glass or organic glass for nomograms is pressed to the supports by means of flat springs pivotally connected with the sides of the plotting board. The lamps for illuminating the nomograms are mounted under the glass. The bottom pointer has handles at its both ends. The rollers for reducing friction are mounted on the axles of the handles.

EFFECT: expanded functional capabilities.

10 dwg